Maternal Anxiety and Infants Birthweight and Length of Gestation. A sibling design

BMC Psychiatry

Table 4 Effect of maternal anxiety on gestational age

	Crude	Step1^*	Step2^**	Step3^***
	Beta [95% CI]	Beta [95% CI]	Beta [95% CI]	Beta [95% CI]
Full cohort
No Anxiety	0 [Reference]	0 [Reference]	0 [Reference]	0 [Reference]
Week 17	-0.64 [-1.12, -0.16]	-0.61 [-1.09, -0.13]	-0.54 [-1.01, -0.07]	-0.44 [-0.91, 0.04]
Week 30	-1.4 [-1.9, -0.89]	-1.35 [-1.86, -0.84]	-1.23 [-1.73, -0.74]	-1.14 [-1.64, -0.64]
Both	-1.89 [-2.53, -1.25]	-1.82 [-2.46, -1.18]	-1.69 [-2.32, -1.06]	-1.52 [-2.15, -0.89]
Sample size	91,165	91,165	91,165	91,165
Sibling cohort
No Anxiety	0 [Reference]	0 [Reference]	0 [Reference]	0 [Reference]
Week 17	0.35 [-0.21, 0.92]	0.35 [-0.21, 0.92]	0.37 [-0.19, 0.94]	0.36 [-0.2, 0.93]
Week 30	-1.08 [-1.79, -0.37]	-1.08 [-1.8, -0.37]	-1.13 [-1.84, -0.42]	-1.11 [-1.82, -0.4]
Both	-0.54 [-1.61, 0.52]	-0.54 [-1.61, 0.53]	-0.6 [-1.68, 0.47]	-0.54 [-1.62, 0.53]
Sample size¹	12,480	12,480	12,480	12,480

^*Adjusted for smoking and alcohol intake.
^**Adjusted for smoking, alcohol intake, parity, birth complication, child’s sex and preeclampsia.
^***Adjusted for smoking, alcohol intake, parity, birth complication, child’s sex, preeclampsia, maternal age, education and marital status.
¹Number of sibling “pairs”.

ISSN: 1471-244X